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-   -   Best floorstanding plan for Alpair 10.2 ? (http://www.diyaudio.com/forums/markaudio/219946-best-floorstanding-plan-alpair-10-2-a.html)

dekiller 18th September 2012 03:24 PM

Best floorstanding plan for Alpair 10.2 ?
 
My order of Pencil 10.2 was cancelled by the builder as he is too busy at the moment. So, I want to have more opinons before going on. Any idea is wellcome.

My preferrance:
Jazz & Classical
Good imaging and detail
Bass response is not important as I will use it with subs most of the time.


Thanks, Brian

Scottmoose 18th September 2012 03:53 PM

Depends what you mean by 'best.' However, if you're planning on using them with dedicated subs, and therefore aren't too concerned about LF extension, there doesn't seem much need for floorstanders unless you want them for aesthetic reasons. A standmount should go low enough to mate to your bass units.

Note that 'imaging' is not really affected by the box except in terms of diffraction effects etc., while 'detail' just means 'low distortion.' Essentially that means you want to ensure driver deflection is held low, and remains well controlled, while group delay is minimised and the aforementioned edge diffraction is addressed. This latter point tends to be less significant with wideband drivers than in many multiway setups, but can be worth looking at depending on the design.

Bob Brines 18th September 2012 04:31 PM

How about these?

http://brinesacoustics.com/Pages/M10-A10/M10_A10.JPG

A bit slimmer than the Pensil's, pretty much the same performance.

Bob

sandyhooker 18th September 2012 04:46 PM

Quote:

Originally Posted by Bob Brines (Post 3169583)
How about these?

http://brinesacoustics.com/Pages/M10-A10/M10_A10.JPG

A bit slimmer than the Pensil's, pretty much the same performance.

Bob


What precisely are "these" ??

Bob Brines 18th September 2012 04:51 PM

M10-A10

dekiller 18th September 2012 04:52 PM

Quote:

Originally Posted by Scottmoose (Post 3169533)
Depends what you mean by 'best.' However, if you're planning on using them with dedicated subs, and therefore aren't too concerned about LF extension, there doesn't seem much need for floorstanders unless you want them for aesthetic reasons. A standmount should go low enough to mate to your bass units.

Note that 'imaging' is not really affected by the box except in terms of diffraction effects etc., while 'detail' just means 'low distortion.' Essentially that means you want to ensure driver deflection is held low, and remains well controlled, while group delay is minimised and the aforementioned edge diffraction is addressed. This latter point tends to be less significant with wideband drivers than in many multiway setups, but can be worth looking at depending on the design.


Scottmoose, thanks for advise. My ultimate choice of loudspeaker type is electrostatic, but, they cannot live with the humidity at South China. So, I am looking for something close.

dekiller 18th September 2012 05:01 PM

Quote:

Originally Posted by Bob Brines (Post 3169583)
How about these?

http://brinesacoustics.com/Pages/M10-A10/M10_A10.JPG

A bit slimmer than the Pensil's, pretty much the same performance.

Bob

Very beautiful.

chrisb 18th September 2012 05:06 PM

I've built a ton of different styles of boxes for almost the entire range of MA drivers, this is the only one so far for the A10 - so I can't compare directly to a Pensil (probably, neither can Bob)

It works very well, and not a complicated build at all.

Sorry Bob, but this one probably took me longer than necessary, as I had to unlearn my normal construction techniques - particularly the bracing scheme ;)

BTW, the elliptical supra baffle is not just cosmetic, and with any well executed full length QW action enclosure for this driver (including more elaborate BLH types) you could be surprised about how little you need to dial in your subs.

Bob Brines 18th September 2012 05:17 PM

Quote:

Originally Posted by chrisb (Post 3169639)
I've built a ton of different styles of boxes for almost the entire range of MA drivers, this is the only one so far for the A10 - so I can't compare directly to a Pensil (probably, neither can Bob)

Ah, but I can! Just to make that comparison, I built a pair of Pensil 10.2's -- as per the plans without bracing. (Sidebar: I certainly would not recommend that you build the Pensil's without bracing. How difficult the Pensil is to build depends on how complicated your bracing scheme is.) The sonic differences between them is subtle and at the lower end. Mine go a bit deeper and stronger. But again, the difference is not much.

So why my design? Scott did the Pensil series for ease of build first and still maintain good sonics. Mine are designed to get the most out of the A10.2 with ease of build secondary. The result is that my cabinets are a bit taller and about half the depth. I like to think of mine as being more pencil-like.

Bob

chrisb 18th September 2012 05:28 PM

Quote:

Originally Posted by Bob Brines (Post 3169662)
Ah, but I can! Just to make that comparison, I built a pair of Pensil 10.2's -- as per the plans without bracing. (Sidebar: I certainly would not recommend that you build the Pensil's without bracing. How difficult the Pensil is to build depends on how complicated your bracing scheme is.) The sonic differences between them is subtle and at the lower end. Mine go a bit deeper and stronger. But again, the difference is not much.

So why my design? Scott did the Pensil series for ease of build first and still maintain good sonics. Mine are designed to get the most out of the A10.2 with ease of build secondary. The result is that my cabinets are a bit taller and about half the depth. I like to think of mine as being more pencil-like.

Bob


mea culpa Bob - and yes these are certainly a more elegant shape than the Pensils for the larger Alpairs (Pensils for the 70mm family are much "slimmer")


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